A three phase, variable frequency drive system is used to power a 4-pole synchronous machine. It is desired to operate the speed of the rotor at 4500RPM with a 230V l−l, rms terminal motor voltage. The dc link voltage is 500V
dc. The mechanical power output from the machine shaft is known to be 15HP. State any assumptions your are making.
(a) 10pts. Solve for the three phase duty cycles that are required to produce stated output.
(b) 5pts. What is the approximate value of the dc link current?
(c) 5pts. What is the theoretically lowest value of dc link voltage that be used?